Dell OptiPlex GX520 - Manual (Page 17)

4. If applicable, remove the computer stand (for instructions, see the documentation that came with the stand) and the cable cover, if attached.
5. Remove the computer cover:
l Remove the mini tower computer cover .
l Remove the desktop computer cover .
l Remove the small form factor computer cover .
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CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.